Answer:
The scientists that are credited for the events described in the developments of the cell theory are
THEODOR SCHWANN, MATTHIAS SCHLEIDEN AND RUDOLF VIRCHAW.
ROBERT HOOKE use the word cell for the structure he observed when he was examining a piece of cork under the microscope.
Anton Van Leeuwenhoek first person to observe a living cell in a drop of pond water.
Explanation:
In the year 1830 THEODOR SCHWANN and MATTHIAS SCHLEIDEN explain the developments of the cell theory based on the study they have done on the living tissue. This theory explains that all living tissues are made up of a cell, the basic unit of life is cell and all new cells arise from the preexisting cell,and Rudolf Virchow he also made some important contributions to the cell theory.
In the year 1665, Robert Hooke observed cork with the help of lens, and he observed that the cork is made of compartments, are connected to each other. He named the word as cell, to the structure he has observed in the cork.
Anton Van Leeuwenhoek he used to study the living organisms present in the rainwater, pounds and well water, then in the year 1674 the first time he observed protozoa and after that bacteria.
Answer:ROBERT HOOKE use the word cell for the structure he observed when he was examining a piece of cork under the microscope.
Anton Van Leeuwenhoek first person to observe a living cell in a drop of pond water.
Explanation: I got it right
RNAi is a technique that silences genes by targeting them and degrading their mRNA. How can this technique be used in scientific laboratories?
A. RNAi has been used in laboratories to make bacteria more susceptible to antibiotics, but has limited application in eukaryotic cells.
B. RNAi is a powerful tool for degrading mRNA, but because it doesn't degrade other types of RNA, its use is limited.
C. RNAi is observed in nature, but it can't be used in laboratories.
D. RNAi allows scientists to turn off one gene specifically to study its effect
The enzyme DNA polymerase works only in the 5′ to 3′ direction. How does this affect the leading strand and the lagging strand?
The enzyme DNA polymerase works only in the 5′ to 3′ direction. How does this affect the leading strand and the lagging strand?
A. DNA polymerase can work on both the leading and the lagging strand but is much faster on the leading strand.
B. DNA polymerase can use only the leading strand as a template. A different enzyme is used to synthesize DNA on the lagging strand.
C. DNA polymerase can work continuously on the leading strand but works discontinuously on the lagging strand, creating Okazaki fragments.
D. DNA polymerase can work continuously on the leading strand but must flip the lagging strand around before it can work on it.
Refer to the family pedigree shown here. In generation I, one parent is affected by the gene mutation and one parent isn't. In generation II, all three children are affected by the gene mutation. What can you conclude about this gene mutation?
A. All children born in future generations will be affected by this disorder.
B. This gene mutation is a dominant disorder.
C. The generation I mother is a carrier of this gene mutation.
D. This gene mutation is a recessive disorder.
Answer:For 1
Option: D
RNA interference process inhibits expression of gene by degrading mRNA. It is a post transcriptional process occur in eukaryotes. RNA is broken into small pieces( siRNA) , these small RNA activates the ribonuclease. Ribonuclease digests the mRNA which codes for certain protein thus halting translation.
Researchers use this mechanism to learn function of gene. This technique is now used to check gene causing certain disease. Artificial mRNA are also available which can be introduced directly in laboratories.
Explanation:
By destroying mRNA, the RNA interference mechanism prevents the expression of genes, hence question 1- d, for 2- c, and 3- b is the correct options.
What is RNA interference?Eukaryotes undergo this post-transcriptional process, small RNA fragments (siRNA) that have been cut apart from RNA activate the ribonuclease.
Translation is stopped by ribonuclease's digestion of the mRNA that codes for a particular protein.
This technique is used by researchers to understand how genes operate, this method is being employed to identify genes responsible for certain diseases.
Therefore, there are also synthetic mRNA options that may be used right away in lab settings, hence for question 1, d is the correct answer.
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How are sex-linked traits inherited? Alleles are passed from the parents’ sex chromosomes to nonsex chromosomes in the offspring. Alleles are passed from the parents’ nonsex chromosomes to the sex chromosomes in the offspring. Alleles are passed from the parents’ sex chromosomes to the sex chromosomes in the offspring. Alleles are passed from the parents’ nonsex chromosomes to nonsex chromosomes in the offspring.
Answer:
alleles are passed from the parents sex chromosomes
Explanation:
sex linked chromosemes are found in the y and x chromosomes in the reproductive cell i.e the sperm and ovum
The right answer for this question is C - sex-linked traits are inherited through alleles, which are passed from the parents' nonsex chromosomes to the sex chromosomes in the offspring. This means that the child will have a combination of both parents' nonsex chromosomes.
Impressions of tropical swamp plants were observed on rocks in polar regions. The impressions were dark black imprints, which means the fossils are examples of BLANK 1 . The fossils tell us that polar regions BLANK 2 .
Question 1
A.) carbonization
B.) mineralization
C.) trace fossils
Question 2
A.) had a tropical plant that could grow in ice
B.) might of had a different climate in the past
C.) will have abundant vegetation
Answer:
1 A, 2 B.
Explanation:
1. In carbonization, a thin film of carbon mineral is formed on the fossils, giving them a dark black coloration, which makes us conclude that the fossils observed are an example of carbonization.
2. The presence of tropical swamp plant impressions in polar regions is an indication of a different, likely warmer climate in the past, in the polar regions, because plants commonly grow in similar conditions as their living counterparts and no tropical swamp plants are known that can live in polar regions today. Lichens that live in the tundra are not real plants.
Answer:
Impressions of tropical swamp plants were observed on rocks in polar regions. The impressions were dark black imprints, which means the fossils are examples of trace fossils . The fossils tell us that polar regions had tropical plants that could grow in ice.
Explanation:
hope it helps :)
A mouse that is homozygous for the dominant trait has the genotype . It has . A mouse that is homozygous for the recessive trait has the genotype . It has . Image of fur color of mice
Answer:
A mouse, his homozygous dominant trait is AA which might be shows black color of fur and with homozygous recessive trait aa which might be shows brown color of fur.
Explanation:
A mouse, his homozygous dominant trait is AA which might be shows black color of fur and with homozygous recessive trait aa which might be shows brown color of fur.
If we cross, both the genotypes dominant trait is AA and recessive trait aa together, then the offspring will produce with all Aa genotypes which shows black color of fur of the mouse. Brown color is suppressed under the effect of dominant trait AA, but it may be appear in the F2 generation.
Convert 9.75 millimeters to centimeters.
centimeters
Answer:
.975
Explanation:
1 millimeter is equal to .1 cm
so divide 9.75 by 10
Susan is planting her garden and choosing plants at the local plant nursery. She tells the clerk that she wants to plant perennials in her front garden bed. How often is Susan expecting the plants that she chooses to germinate and flower?
A. Sprout this year and need to be replanted
B. Sprout every year for two years
C. Sprout every year, year after year
D. Grow into larger, permanent trees and shrubs
Answer:
C) Sprout every year, year after year
Explanation:
A perennial plant or simply perennial is a plant that lives more than two years. Some sources cite perennial plants being plants that live more than three years. The term is often used to differentiate a plant from shorter-lived annuals and biennials.
Answer:
The correct answer will be option C (Sprout every year, year after year).
Explanation:
Perennials are the herbaceous plants which live for many years or seasons. These plants die in falling season and then again come back in spring from the roots which were dormant during the winter season.
They have longer life-span and sprout every year like Hibiscus, Lavender, Lilies and Rose Bushes.
Thus, option C (Sprout every year, year after year) is the correct answer.
Which of the following is a heterotroph?
sunflower
potato
butterfly
soybeans
Answer:
Butterfly
Explanation:
a heterotroph is an organism that cannot make its own food, and therefore relies on other organisms for sustenance.
potatoes, sunflowers and soybeans are all plants and make their own food through photosynthesis
(they are called autotrophs)
However a butterfly relies on flowering plants to provide the nectar that it consumes.
if all the flowering plants suddenly died the butterflies would most likely die as well because their food source has been eliminated.
therefore the butterfly is a heterotroph
Temperatures in ponds and lakes vary by season.
Please select the best answer from the choices provided
T
F
Temperature varies seasonally in ponds and lakes. In summer, the temperature can range from 4°C at ground level to 22°C at the top.
In winter, the temperature can be 4 °C below and 0 °C above (ice).
What are the seasons in freshwater?
Freshwater biomes can be found all over the world. You have many seasons. A single pond can be as low as 39 degrees Fahrenheit below and 72 degrees Fahrenheit above during the summer season. The same pond could be 39 degrees Fahrenheit below and 32 degrees Fahrenheit above during the winter season.Learn more about temperature here.
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A lone male wolf, who doesn't have a pack, travels the forest. When he reaches a new hill that he hasn't been on before, he spends a large amount of time sniffing the trees and rock outcrops. Finally, he turns and heads back from where he came, recognizing this is the territory of another wolf. What's most likely responsible for communicating this information to the wolf?
A. The tracks of other wolves on the hill
B. Pheromones
C. Markings on the trees
D. Language
Answer:
The correct answer is option B. pheromones.
Explanation:
Pheromones are chemical substances that are released and produced by a different type of animals, into the environment, for marking their territory or affecting behaving of its species.
Wolves communicate by the chemical messages using their sense of smell. Such chemical messages are called pheromones, between different members of the same species.
Thus, the correct answer is option B. pheromones.
State one way a complete blockage at location X would affect the reproductive process ? Please answer !!
Answer:
There would be no fertilization.
Explanation:
When the fallopian tube is blocked, even after ovulation (an egg released by the ovary), it will be unable to travel down the fallopian tube towards the uterus. This way, even when the sperm swim up to the tube (where fertilization of the egg usually occur) after copulation, it will be unable to meet the egg and fertilize it. There will never be conception as long as there is blockage on location X.
Which of the following is true of red blood cells?
A. They have multiple nuclei
B. Once created in bone marrow, they circulate for our lifetime
C. They live for only 120 days
D. They live for only about 20 days
Answer:
C. They live for only 120 days
Explanation:
Red blood cells are small and biconcave cells that are known for their lack of nucleus. (Rules out A) Aside form that, they also lack mitochondria and robsomes. They are created in the bone marrow and they live for about 100 to 120 days (rules out B and D) before macrophages recycle them.
Answer:
C
Explanation:
What is a chromosome
Answer:
the correct answer is d my good man
Explanation:
Answer:
D. A strand of DNA
Explanation:
What is an outcome of gene regulation
A. every cell produces all types of proteins
B. each cell is able to produce only one protein
C. each cell produces only the proteins it needs
D. each cell contains the genes for only one protein
Gene regulation results in each cell producing only the proteins it requires. It allows a cell to express or suppress genes as needed, creating differences between cell types.
Explanation:The outcome of gene regulation is that each cell produces only the proteins it needs (option C). In other words, gene regulation allows a cell to express or suppress gene information as necessary, thus helping it respond appropriately to its changing needs and the conditions around it. This is why, for instance, a liver cell differs from a muscle cell, even though they contain the same genetic information. The liver cell will only produce proteins necessary for its functions whilst suppressing the genes required for muscle functions, and vice versa.
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Define selective pressure
Answer:
Selective pressure is any phenomena which alters the behavior and fitness of living organisms within a given environment. It is the driving force of evolution and natural selection, and it can be divided into two types of pressure: biotic or abiotic.
Explanation:
A selective pressure is any reason for an organism with a certain phenotype to either have a benefit of survival, or a disadvantage.
In what way are cities microclimates?
Hello There!
An "Urban Microclimate" is the climate of a smaller area in an urban envioment, which may be different to that of another section of the same urban environment.
Cities are microclimates because cities are warmer than the areas around them.
Answer: Micro-climate refers to the small scale climatic condition prevailing in a small area.
Micro-climate in cities differs from place to place depending upon the amount of solar radiations absorbed in that area, amount of precipitation, moisture content, overall surrounding temperature and air pressure.
Most of the cities micro-climates are generally warmer because of its high absorption of solar radiation, lack of spaces between the houses and building and high emission of gases, creating pollution.
How do organ systems work together to deliver nutrients from food throughout the body?
Answer: The digestive system breaks down food and the circulatory system transports nutrients to cells. Hope this helps.
Explanation:
name three things that happen within two weeks of fertilization?
Answer:
ovulation, Hormones Rise and Egg Travels to the Fallopian Tube
Explanation:
Answer:
germination and first growth
When does the cell pinch off and divide into two daughter cells in mitosis?
During cytokinesis, cell pinch off and divides into 2 daughter cells in mitosis.
What is cytokinesis?The division of the nucleus occurs after the cytoplasm (cytokinesis) during the cell cycle (karyokinetic).
Different cytokinesis processes take place during cell division in animal and plant cells.
Animal cells undergo cytokinesis by the production of two daughter cells as the parent cell's plasma membrane pinches inward along the equator, whereas plant cells undergo cytokinesis through the formation of a cell plate.
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Which causes a sea breeze
The wind will blow from the higher pressure over the water to lower pressure over the land causing the sea breeze. The sea breeze strength will vary depending on the temperature difference between the land and the ocean. At night, the roles reverse. The air over the ocean is now warmer than the air over the land.
hopefully i got this right and also helped
Why does meiosis produce cells with half the chromosomes?
O
A. Most of the chromosomes are not necessary to keep an organism
alive.
B. A gamete needs only half the number of chromosomes because
two gametes join together.
O
C. It makes the gametes easier to move around in the organism.
O
D. It is faster to produce gametes with fewer chromosomes.
The meiosis produces cells with half the chromosomes A gamete needs only half the number of chromosomes because two gametes join together.
Structure of DNA. Most DNA is found inside the nucleus of a cell, where it forms the chromosomes. Chromosomes have proteins called histones that bind to DNA. DNA has two strands that twist into the shape of a spiral ladder called a helix. DNA is made up of four building blocks called nucleotides: adenine (A), thymine (T), guanine (G), and cytosine (C). The nucleotides attach to each other (A with T, and G with C) to form chemical bonds called base pairs, which connect the two DNA strands. Genes are short pieces of DNA that carry specific genetic information.
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which microscope creates a two dimensional image
A compound microscope creates a two-dimensional image. It's constructed from two convex lenses, with the first serving as the eyepiece and the second as the objective lens. It does not construct a three-dimensional image like confocal microscopes.
Explanation:.As the light travels through these lenses, the image is maximally focused at a single distance from the observer creating a two-dimensional image. A compound microscope provides a magnified and clear view of tissue structure as well as the anatomy of the whole organism, but unlike other forms of microscopy, does not construct a three-dimensional image by scanning multiple z-planes successively like the confocal microscope.
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Final answer:
A compound microscope typically creates a two-dimensional image through the use of convex lenses. Confocal microscopes enhance this capability, allowing for the capture of high-resolution two-dimensional images at different depths that are reconstructed into three-dimensional images using computer software.
Explanation:
The type of microscope that creates a two-dimensional image is a standard compound microscope, which generally comprises two sets of convex lenses: the eyepiece and the objective lens. However, when it comes to sophisticated microscopy techniques capable of capturing higher resolution images, confocal microscopy enters the picture. Despite its capability of producing numerous two-dimensional high-resolution images at various depths, a confocal microscope is also able to reconstruct these images into a three-dimensional image with the help of specialized software. The confocal microscope makes use of a laser to scan the specimen at multiple z-planes, using a pinhole to eliminate out-of-focus light, hence significantly enhancing images of thicker specimens. Contrastingly, the two-photon microscope represents a more advanced form of imaging, capable of penetrating deeper into thick specimens and is highly suitable for live cell imaging in intact tissues.
Helppppppppppppppppppppppppp!!!!?!?!?!?!!!
Answer:
J.J Thomas - B
John Dalton - A
Ernest Rutherford - D
James Chadwick - C
During times of stress, Yanira notices that her heart pounds a little faster than normal. What part of the brain is
responsible for her increased heart rate?
Brain stem
Cerebellum
Frontal lobe.
Occipital lobe
Answer:
Cerebellum
Explanation:
The cerebellum is a region of the brain whose main function is to integrate the sensory and motor pathways. There is a large number of nerve bundles that connect the cerebellum with other brain structures and with the spinal cord. The cerebellum integrates all the information received to specify and control the orders that the cerebral cortex sends to the musculoskeletal system through the motor pathways. It is the regulator of physiological tremor.
how is mitosis different in plants and animals?
A. in animals the dna is one circular chromosome
B. in plants the dna is not duplicated
C in plants a new cell wall forms to split the cell
D in animals there is no g0 phase or g2 phase
Answer: c in plants a new cell wall forms to split the cell
Yes the answer’s C.
so what’s your question?(tell me in comments)
C. In plants, a new cell wall forms to split the cell.
Mitosis is the process of cell division that occurs in both plants and animals, but there are key differences in how the process is completed.
In animals, during the final stages of mitosis (cytokinesis), the cell membrane pinches inwards, forming a cleavage furrow, which eventually splits the cell into two daughter cells. This process is possible because animal cells lack a rigid cell wall, allowing the membrane to easily bend and constrict.
In plants, however, the presence of a rigid cell wall makes it impossible for the cell to constrict in the same manner. Instead, during cytokinesis, plant cells form a cell plate in the center of the dividing cell. This cell plate grows outward, eventually developing into a new cell wall that separates the two daughter cells.
In human females, the process of cell division, meiosis occurs in cells of the:
Answer:
ovaries
Explanation:
In human females, the process of cell division, meiosis occurs in cells of the ovaries.
The process of meiosis occurs in the sexual organs of sexually producing organisms.
Answer:
Ovaries
Explanation:
In human females, the process of cell division, meiosis occurs in cells of the Ovaries.
This is also called oogenesis.
Which part of the compound light microscope provides the light source?
Part A
Part B
Part E
Part F
Pretty sure its Part F
From the diagram, the part of the compound light microscope that provides the light source would be the mirror. The correct answer would be the part F.
In a compound light microscope, the light source can be:
the mirror, orthe electric bulbThe mirror works by collecting rays of light from the environment and then transmitting such to the stage through the condenser. The electric bulb generate light rays by itself.
Since the microscope in the diagram has no bulb but a mirror, the only light source remains the mirror.
F - mirrorE - condenserD - stageC - objective lensB - body tubeA- ocularMore on the light microscope can be found here: https://brainly.com/question/13884997
An organ that does not secrete digestive enzymes is the
a. pancreas
b. small intestine
c. esophagus
d. salivary gland
What will occur when the carrying capacity for humans is met?
A. Diseases will increase.
B. Natural disasters will increase.
C. The death rate will decrease.
D. The population will increase.
Answer:
A. Diseases will increase
Answer: A. Diseases will increase.
Explanation:
A limiting factor is the one which is potent enough to limit the growth, abundance and distribution of the population of species in an ecosystem. Carrying capacity is the maximum number of the population of species which an ecosystem can support by availing resources. If the population exceeds above the carrying capacity, it starts declining.
According to the situation given, diseases will increase is the correct option. Diseases can be limiting factor for reducing the population of humans in an area. Hence, will maintain the carrying capacity.
Study the diagram of a desert food chain .
What would most likely happen if the kangaroo rats were killed off and removed from the food chain ?
The removal of kangaroo rats from a desert food chain could lead to an overabundance of seeds and a decline in predator populations, such as kit foxes, potentially causing a collapse of the entire food web.
If the kangaroo rats were removed from a desert food chain, a ripple effect would take place, which would influence the entire ecosystem. As consumers of seeds, the absence of kangaroo rats could lead to an overabundance of seeds. Without kangaroo rats acting as a food source for their predators, such as kit foxes, these predators might face a decline in population due to a lack of food. This can create an imbalance, potentially leading to the overpopulation of some species while others might diminish or even become extinct. As tertiary consumers lose their prey, they may starve and die, which could even lead to the collapse of the entire food web. Ecosystems are interconnected, so the removal of one species, especially a key species like the kangaroo rat, can have far-reaching consequences.
When one animal looks like another animal to protect itself, this adaptation is called
Answer: I believe that would be camouflage.
Explanation:
Camouflage is a defense mechanisms.
this is called mimicry. mimicry is the imitation or looking like something else like in this case. this is also because mimicry is the act of copying the sounds or behaviour of another person or animal.